How to Make Lego Planetary Gear with Hailfire Droid

[DLuders]

Here's YouTube video by Mrob143, who is "Using the LEGO Hailfire Droid Wheel to make 2 nested planetary gear mechanisms" :

YouTube guest Nonskids noted that, with Planetary Gears, "Efficiency is actually a bit less because of friction, but planetary gears have a huge advantage over regular gear sets in that gear ratios can be changed without stopping or physically changing gears, by alternately holding and driving different elements, (sun, planet or annulus gear) - combining several planetary gears sets together allows almost any gear ratio to be achieved including reverse, and it can be done without stopping the driving gear ,, that's how a automatic transmission works....Yeah, that's how the gear shift on my handheld power dril works, too."

This is illustrated in KRiMAGH's LEGO CAD Planetary Gear video:

Flippetyhop posted a video of his Lego Automatic Gearbox Transmission: "This is a prototype for a lego automatic transmission using planetary gear arrangements. In theory it has 4 speeds, but in practice it seems to have 3. Haven't tried it out on a proper model yet. I don't think anyone else has tried one like this? Let me know what you think":

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[Burf2000]

I don't really see why you need this? but it looks cool

[DLuders]

Well you could build a slowly-turning HUGE turntable with planetary gears running inside of the Hailfire Droid wheel. The driven Hailfire Droid wheel could be sitting on top of another Hailfire Droid wheel (separated by Lego Soccer Ball "ball bearings").

[Blakbird]

I don't really see why you need this? but it looks cool

What does need have to do with anything?

Seriously, I have been waiting for a LEGO planetary system for a long time. This particular version is too large to be of much practical use, but I like the idea.

[CP5670]

This would be more interesting to try at a smaller scale with the Power Miners wheels. Planetary gears bring lots of possibilities to Technic, but the hailfire droid wheel is too large to be used in an actual model.

[Jurgen Krooshoop]

These planetary gears are fascinating. I'm sure they will be usefull in a Lego-model somehow.